Re: [Qemu-stable] [Qemu-devel] [PATCH v4 2/3] qapi: fix crash when a parameter is missing

[Marc-André Lureau]

Hi Markus

----- Original Message -----
> Markus Armbruster <address@hidden> writes:
> 
> > Marc-André Lureau <address@hidden> writes:
> >
> >> Calling:
> >>
> >> { "execute": "qom-set",
> >>   "arguments": { "path": "/machine", "property": "rtc-time" } }
> >>
> >> Will crash with:
> >>
> >> qapi/qapi-visit-core.c:277: visit_type_any: Assertion `!err != !*obj'
> >> failed
> >
> > This is actually a recent regression.  Let's add "Broken in commit
> > 5c678ee."  Can do on commit.
> >
> >> Clear the obj and return an error.
> >>
> >> The patch also fixes a similar potential crash in qmp_input_type_null()
> >> by checking qmp_input_get_object() returned a valid qobj.
> >>
> >> Signed-off-by: Marc-André Lureau <address@hidden>
> >> Reviewed-by: Eric Blake <address@hidden>
> 
> I'd like to rephrase like this, if it's all right with you:
> 
>     qapi: Fix crash when 'any' or 'null' parameter is missing
> 
>     Unlike the other visit methods, visit_type_any() and visit_type_null()
>     neglect to check whether qmp_input_get_object() succeeded.  They crash
>     when it fails.  Reproducer:
> 
>     { "execute": "qom-set",
>       "arguments": { "path": "/machine", "property": "rtc-time" } }
> 
>     Will crash with:
> 
>     qapi/qapi-visit-core.c:277: visit_type_any: Assertion `!err != !*obj'
>     failed
> 
>     Broken in commit 5c678ee.  Fix by adding the missing error checks.
> 
> Also:
> Reviewed-by: Markus Armbruster <address@hidden>

Looks good to me, thanks
>